The Elric saga would make an excellent project. In fact a good chunk of Moorcock’s back catalogue would be fine fodder for filming.
One Moorcock movie has been made, The Final Programme.
https://www.imdb.com/title/tt0070289/
I saw it when it was released in 1973, there are characters who are in his various fantasy novels, which all interconnect anyway.
I’d be interested to see someone take on Charles Stross’ Laundry Files.
Oh yes! Actually Stross has written a bunch of books that would translate well to the screen, Iron Sunrise and Saturn’s Children would be good, as they’re stand-alone novels.